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99999820 = 22541121951
BaseRepresentation
bin1011111010111…
…10000001001100
320222011111222001
411331132001030
5201044443240
613531202044
72322661444
oct575360114
9228144861
1099999820
11514a1388
12295a6324
13179436bb
14d3d1124
158ba489a
hex5f5e04c

99999820 has 24 divisors (see below), whose sum is σ = 215123328. Its totient is φ = 39024000.

The previous prime is 99999787. The next prime is 99999821. The reversal of 99999820 is 2899999.

It is a nialpdrome in base 10.

It is not an unprimeable number, because it can be changed into a prime (99999821) by changing a digit.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 60156 + ... + 61795.

It is an arithmetic number, because the mean of its divisors is an integer number (8963472).

Almost surely, 299999820 is an apocalyptic number.

It is an amenable number.

99999820 is an abundant number, since it is smaller than the sum of its proper divisors (115123508).

It is a pseudoperfect number, because it is the sum of a subset of its proper divisors.

99999820 is a wasteful number, since it uses less digits than its factorization.

99999820 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 122001 (or 121999 counting only the distinct ones).

The product of its (nonzero) digits is 944784, while the sum is 55.

The square root of 99999820 is about 9999.9909999959. The cubic root of 99999820 is about 464.1586048658.

The spelling of 99999820 in words is "ninety-nine million, nine hundred ninety-nine thousand, eight hundred twenty".

Divisors: 1 2 4 5 10 20 41 82 164 205 410 820 121951 243902 487804 609755 1219510 2439020 4999991 9999982 19999964 24999955 49999910 99999820