20904620 has 24 divisors (see below), whose sum is σ = 47891088. Its totient is φ = 7601600.

The previous prime is 20904619. The next prime is 20904641. The reversal of 20904620 is 2640902.

20904620 = 1613² + 1614² + ... + 1620².

It is an unprimeable number.

It is a polite number, since it can be written in 7 ways as a sum of consecutive naturals, for example, 47291 + ... + 47730.

It is an arithmetic number, because the mean of its divisors is an integer number (1995462).

Almost surely, 2^20904620 is an apocalyptic number.

20904620 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20904620 is an abundant number, since it is smaller than the sum of its proper divisors (26986468).

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

20904620 is a wasteful number, since it uses less digits than its factorization.

20904620 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 95041 (or 95039 counting only the distinct ones).

The product of its (nonzero) digits is 864, while the sum is 23.

The square root of 20904620 is about 4572.1570401726. The cubic root of 20904620 is about 275.4740913028.

The spelling of 20904620 in words is "twenty million, nine hundred four thousand, six hundred twenty".