20953940280 has 128 divisors (see below), whose sum is σ = 77368435200. Its totient is φ = 4421048832.

The previous prime is 20953940279. The next prime is 20953940281. The reversal of 20953940280 is 8204935902.

It is an interprime number because it is at equal distance from previous prime (20953940279) and next prime (20953940281).

It is a super-2 number, since 2×20953940280² (a number of 21 digits) contains 22 as substring.

It is a Harshad number since it is a multiple of its sum of digits (42).

It is a congruent number.

It is not an unprimeable number, because it can be changed into a prime (20953940281) by changing a digit.

It is a polite number, since it can be written in 31 ways as a sum of consecutive naturals, for example, 948510 + ... + 970349.

It is an arithmetic number, because the mean of its divisors is an integer number (604440900).

Almost surely, 2^20953940280 is an apocalyptic number.

20953940280 is a gapful number since it is divisible by the number (20) formed by its first and last digit.

It is an amenable number.

20953940280 is an abundant number, since it is smaller than the sum of its proper divisors (56414494920).

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

20953940280 is a wasteful number, since it uses less digits than its factorization.

20953940280 is an evil number, because the sum of its binary digits is even.

The sum of its prime factors is 1918893 (or 1918889 counting only the distinct ones).

The product of its (nonzero) digits is 155520, while the sum is 42.

The spelling of 20953940280 in words is "twenty billion, nine hundred fifty-three million, nine hundred forty thousand, two hundred eighty".